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  #1 (permalink)  
Old 04 Mar 2010, 11:34 am
tony
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Default cooling fan

90 accord 4cyl. Cooling fan doesn't always work. Causing heating problems.
Any ideas?


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  #2 (permalink)  
Old 04 Mar 2010, 01:43 pm
E. Meyer
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Default Re: cooling fan

On 3/4/10 11:34 AM, in article AOWdncGuPqPQchLWnZ2dnUVZ_qGdnZ2d@neonova.net,
"tony" <tgent@wilkes.net> wrote:

> 90 accord 4cyl. Cooling fan doesn't always work. Causing heating problems.
> Any ideas?
>
>


Doesn't always or doesn't ever? Makes a difference. Does it always come on
with the AC?

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  #3 (permalink)  
Old 04 Mar 2010, 01:56 pm
tony
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Default Re: cooling fan

ac fan works fine(seperate fan).radiator cooling fan works about half the
time.
"E. Meyer" <e.p.meyer@verizon.net> wrote in message
news:C7B56968.183E7%e.p.meyer@verizon.net...
> On 3/4/10 11:34 AM, in article
> AOWdncGuPqPQchLWnZ2dnUVZ_qGdnZ2d@neonova.net,
> "tony" <tgent@wilkes.net> wrote:
>
>> 90 accord 4cyl. Cooling fan doesn't always work. Causing heating
>> problems.
>> Any ideas?
>>
>>

>
> Doesn't always or doesn't ever? Makes a difference. Does it always come
> on
> with the AC?
>



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  #4 (permalink)  
Old 04 Mar 2010, 02:06 pm
E. Meyer
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Default Re: cooling fan

On most Hondas, they both come on with the AC. If it works some of the
time, the first thing I would check is that the radiator is full.

I have to ask though, how do you know when it should come on but doesn't
(given that its not supposed to run all the time)? What are the other
symptoms?


On 3/4/10 1:56 PM, in article 0q-dnTsGC6P7jQ3WnZ2dnUVZ_uOdnZ2d@neonova.net,
"tony" <tgent@wilkes.net> wrote:

> ac fan works fine(seperate fan).radiator cooling fan works about half the
> time.
> "E. Meyer" <e.p.meyer@verizon.net> wrote in message
> news:C7B56968.183E7%e.p.meyer@verizon.net...
>> On 3/4/10 11:34 AM, in article
>> AOWdncGuPqPQchLWnZ2dnUVZ_qGdnZ2d@neonova.net,
>> "tony" <tgent@wilkes.net> wrote:
>>
>>> 90 accord 4cyl. Cooling fan doesn't always work. Causing heating
>>> problems.
>>> Any ideas?
>>>
>>>

>>
>> Doesn't always or doesn't ever? Makes a difference. Does it always come
>> on
>> with the AC?
>>

>
>


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  #5 (permalink)  
Old 04 Mar 2010, 02:23 pm
tony
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Posts: n/a
Default Re: cooling fan

Engine heat mostly when idling. Coolant fine. Does this model have a timer?
I just heard it come on. Ran for about 30 sec's or less.
"E. Meyer" <e.p.meyer@verizon.net> wrote in message
news:C7B56EEF.183F8%e.p.meyer@verizon.net...
> On most Hondas, they both come on with the AC. If it works some of the
> time, the first thing I would check is that the radiator is full.
>
> I have to ask though, how do you know when it should come on but doesn't
> (given that its not supposed to run all the time)? What are the other
> symptoms?
>
>
> On 3/4/10 1:56 PM, in article
> 0q-dnTsGC6P7jQ3WnZ2dnUVZ_uOdnZ2d@neonova.net,
> "tony" <tgent@wilkes.net> wrote:
>
>> ac fan works fine(seperate fan).radiator cooling fan works about half the
>> time.
>> "E. Meyer" <e.p.meyer@verizon.net> wrote in message
>> news:C7B56968.183E7%e.p.meyer@verizon.net...
>>> On 3/4/10 11:34 AM, in article
>>> AOWdncGuPqPQchLWnZ2dnUVZ_qGdnZ2d@neonova.net,
>>> "tony" <tgent@wilkes.net> wrote:
>>>
>>>> 90 accord 4cyl. Cooling fan doesn't always work. Causing heating
>>>> problems.
>>>> Any ideas?
>>>>
>>>>
>>>
>>> Doesn't always or doesn't ever? Makes a difference. Does it always come
>>> on
>>> with the AC?
>>>

>>
>>

>



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  #6 (permalink)  
Old 04 Mar 2010, 02:55 pm
Tegger
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Default Re: cooling fan

"tony" <tgent@wilkes.net> wrote in
news:MeudnTFoq-lciw3WnZ2dnUVZ_radnZ2d@neonova.net:

> Engine heat mostly when idling. Coolant fine. Does this model have a
> timer? I just heard it come on. Ran for about 30 sec's or less.




It's not likely the timer. Your problem is most likely the thermo switch in
the water jacket.

Disconnect the wires at the switch and short them together. Rad fan should
run continuously. If it does, the thermo switch needs to be replaced.



--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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  #7 (permalink)  
Old 04 Mar 2010, 05:50 pm
Tegger
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Default Re: cooling fan

Tegger <invalid@invalid.inv> wrote in
news:Xns9D31A1E917F8Ategger@208.90.168.18:

> "tony" <tgent@wilkes.net> wrote in
> news:MeudnTFoq-lciw3WnZ2dnUVZ_radnZ2d@neonova.net:
>
>> Engine heat mostly when idling. Coolant fine. Does this model have a
>> timer? I just heard it come on. Ran for about 30 sec's or less.

>
>
>
> It's not likely the timer. Your problem is most likely the thermo
> switch in the water jacket.
>
> Disconnect the wires at the switch and short them together. Rad fan
> should run continuously. If it does, the thermo switch needs to be
> replaced.
>
>
>


CLARIFICATION: This should be done when the engine has warmed up to the
point when the fans would be on anyway (~205F at the upper rad hose inlet).

Also, your model may have the thermoswitch in the bottom of the rad, so
check there too.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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  #8 (permalink)  
Old 05 Mar 2010, 06:59 am
C. E. White
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Default Re: cooling fan


"Tegger" <invalid@invalid.inv> wrote in message
news:Xns9D31A1E917F8Ategger@208.90.168.18...
> "tony" <tgent@wilkes.net> wrote in
> news:MeudnTFoq-lciw3WnZ2dnUVZ_radnZ2d@neonova.net:
>
>> Engine heat mostly when idling. Coolant fine. Does this model have
>> a
>> timer? I just heard it come on. Ran for about 30 sec's or less.

>
> It's not likely the timer. Your problem is most likely the thermo
> switch in
> the water jacket.
>
> Disconnect the wires at the switch and short them together. Rad fan
> should
> run continuously. If it does, the thermo switch needs to be
> replaced.


I am not sure the guy actaully has a problem. He said the fan came on.
He probably should define "heating problems." The fans aren't suppose
to run all the time when the A/C isn't on.

BTW, I don't know of any cars that have a "timer" on the electric
cooling fan. All that I am aware of have thermostats (as you
mentioned). Some are single stage, and some are two stage (either
running the single fan at two different speeds, or running multiple
fans as needed). Some cars also have switches in the A/C lines to turn
on the fan(s) as needed for the A/C instead of merely running them
whenever the A/C is switched on.

I think the first stage in helping this guy is learning what he meant
when he said "Cooling fan doesn't always work. Causing heating
problems." Is the car actually overheating, or does the gauge just
move up the scale but stay in the "normal" zone? The fans are not
suppose to always be on.

Ed


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  #9 (permalink)  
Old 05 Mar 2010, 09:15 am
Tegger
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Default Re: cooling fan

"C. E. White" <cewhite3@mindspring.com> wrote in news:hmqv5v$4rm$1
@news.eternal-september.org:

>
> "Tegger" <invalid@invalid.inv> wrote in message
> news:Xns9D31A1E917F8Ategger@208.90.168.18...
>> "tony" <tgent@wilkes.net> wrote in
>> news:MeudnTFoq-lciw3WnZ2dnUVZ_radnZ2d@neonova.net:
>>
>>> Engine heat mostly when idling. Coolant fine. Does this model have
>>> a
>>> timer? I just heard it come on. Ran for about 30 sec's or less.

>>
>> It's not likely the timer. Your problem is most likely the thermo
>> switch in
>> the water jacket.
>>
>> Disconnect the wires at the switch and short them together. Rad fan
>> should
>> run continuously. If it does, the thermo switch needs to be
>> replaced.

>
> I am not sure the guy actaully has a problem. He said the fan came on.
> He probably should define "heating problems." The fans aren't suppose
> to run all the time when the A/C isn't on.
>
> BTW, I don't know of any cars that have a "timer" on the electric
> cooling fan.




Some Accords have one. It's used under certain conditions to run the fan
for five minutes AFTER the engine has shut down. When the timer fails,
the fan will not run after the engine shuts down.

This generation of Accord normally has trouble with the thermoswitch
itself, or with the relay. If the relay is bad, shorting the
thermoswitch wires will not make the fan run. Provided the engine is
fully-hot to begin with, that is.

Thermoswitches can fail in five ways:
1) failing to turn the fan on at all,
2) running the fan all the time,
3) turning on the fan too late,
4) turning the fan on too soon,
5) shutting the fan off too soon.



> All that I am aware of have thermostats (as you
> mentioned). Some are single stage, and some are two stage (either
> running the single fan at two different speeds, or running multiple
> fans as needed). Some cars also have switches in the A/C lines to turn
> on the fan(s) as needed for the A/C instead of merely running them
> whenever the A/C is switched on.
>
> I think the first stage in helping this guy is learning what he meant
> when he said "Cooling fan doesn't always work. Causing heating
> problems." Is the car actually overheating, or does the gauge just
> move up the scale but stay in the "normal" zone? The fans are not
> suppose to always be on.
>



That's a good point. OP should report the position of the temperature
gauge needle when the problem is occurring. I assumed he meant the
engine was overheating at idle.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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  #10 (permalink)  
Old 05 Mar 2010, 09:36 am
pws
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Posts: n/a
Default Re: cooling fan

Tegger wrote:

> Some Accords have one. It's used under certain conditions to run the fan
> for five minutes AFTER the engine has shut down. When the timer fails,
> the fan will not run after the engine shuts down.


My 1995 Accord does this. Do you know why this is? I have never seen a
car that runs the fan after being shut off before and I can't imagine
any reason for additional cooling after turning off the engine. That
seems like the last time that a fan is needed.

In less than 6 months of driving it, I have had at least 3 people tell
me that I left the car on when they heard the fan running, and when I
told them that it is just the fan, that confused them as they also can't
see a reason for it to be designed this way.

It is irritating enough that it has had me thinking about figuring out a
way to make e fan stop coming on after turning off the engine unless
there is a good reason for it.

Thanks!




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